1. Department of Psychology; University of Alberta; Edmonton AB Canada
2. Center for Neuroscience; University of Alberta; Edmonton AB Canada
3. Division of Birds; National Museum of Natural History; Smithsonian Institution; Washington DC
4. Center for Macroecology; Evolution and Climate; University of Copenhagen; DK-2100 Copenhagen Ø Denmark
5. Department of Neuroscience; Canadian Center for Behavioral Neuroscience; University of Lethbridge; Lethbridge AB Canada